Selwyn Polit has created a fantastic Drupal 9 and 10 developer reference guide called Drupal at your fingertips. The book is a reference guide that explains the various APIs within Drupal and examples of code for using them. The book's contents are available online, and all of the content is licensed under Creative Commons Attribution 4.0, making it available to share and modify with attribution. You can find the Drupal at your fingertips book online at: https://selwynpolit.github.io/d9book/ and its source at https://github.com/selwynpolit/d9book/tree/gh-pages.
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